Log Message:
audio/spotify-player: update to 0.5.1

v0.5.1
-Hot fix panic when accessing index out of range 7fa610b

v0.5.0
Brief description of changes
-Rewrite application state's data model in #19 that separates application's
 data from application's states
-Improve data locking performance in #20 that uses parking_lot for better
 performance and restricts the locking scope to local in functions.
-Change the application's behavior on startup in #21 that connects to an
 available device if no playback is found.
-Add a file logger in #23.
-Add a library page in #24.
-Rewrite the context page state's structure in #25.
-Reduce the number of possible panics (88567e1) and handle the integrated
 player's events (2e64d1d).